21371

Appears in sequences

• Number of n-step spiral self-avoiding walks on hexagonal lattice, where at each step one may continue in same direction or make turn of 2*Pi/3 counterclockwise.at n=36A000511
• Number of partitions satisfying 0 < cn(0,5) + cn(2,5) + cn(3,5).at n=37A039899
• Numbers k such that the concatenation 1,2,3,...,(k-1) is divisible by k.at n=9A110740
• Fibonacci sequence beginning 14, 13.at n=16A206564
• a(n) = Sum_{k=1..n} binomial(floor(n/k)+4,5).at n=16A365439
• Expansion of 1/sqrt((1+x)^3 * (1-7*x)).at n=6A383947